I've run the drag radials on my supercharged mustang and then later on my Z06. Both cars were daily drivers. Totally streetable tires. Handling is good (only noticably sloppier than track tires when you're on the track) and traction in the rain is surprisingly good. In fact, on the wet, the nittos stick much better than any high performance street tire that I've ever used. Their only weakness is hydroplaning, as they don't have much of a rain groove. But for what it's worth, I ran the drag radials on my mustang in Seattle for over a year and never hydroplaned, but they were in good condition with a lot of tread depth left. Later on, here in SoCal with the tread down to the wearbars, I felt some hydroplaning in my Z06.
In my experience, the Nittos are an awesome tire for a daily driver. Ride quality is nice because of the somewhat softer sidewall. They also don't start getting incredibly sticky until they're heated up, which means that on the street, they don't pick up as much gravel as say, the Kumho V700's do (I later ran the Kumho's on my Mustang and run them now on my Pantera). Saves some wear and tear on your body paint and rims. Plus, I got about 15k miles out of them, and that's with a number of autocross events.
